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Enhancement of magnetic properties and thermal stability of nanocrystalline (NdDyTb)_(12.3)(FeZrNbCu)_(81.7)B_(6.0) alloy with Co substitution

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International Journal of Minerals,Metallurgy and Materials 2009年第6期16卷 696-700页

作者： Xiao-qian Bao Wei Li Jie Zhu Xue-xu Gao shou-zeng zhou State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China College of Materials Science and Engineering Yanshan University Qirdauangdao 066004 China

The major drawbacks of Nd-Fe-B magnets are relatively low Curie temperature and poor thermal stability. Ribbons with the near stoichiometric 2：14：1 composition of Nd10.8Dy0.75Tb0.75Fe79.7-xCoxZr0.8Nb0.8Cu0.4B6.0 （x=0, 3, 6, 9, 12, 15） were prepared by rapid quenching and subsequent heat treatment. The effect of Co element on the magnetic properties, thermal stability, and microstructure of the ribbons was systematically studied by vibrating sample magnetometer （VSM）, thermal magnetic analysis, atomic force microscopy （AFM）, and transmission electron microscopy （TEM）. It was found that Co substitution was significantly effective in improving the magnetic properties and the thermal stability of nanocrystalline ribbons. Although the intrinsic coercivity decreased from 1308.7 kA/m for x=0 to 817.4 kA/m for x=15, the remanence polarization and maximum energy product increased from 0.839 T and 116.5 kJ/m^3 for the Co-free samples to 1.041 T and 155.1 kJ/m^3 for the 12at% Co-substituted samples, respectively. About 10 K increase in Curie temperature was observed for the 2：14：1 phase with 1at% Co substitution. The absolute values of temperature coefficients of induction and coercivity were significantly decreased with Co substitution, which may be attractive for high operational temperature applications. The microstructure of nanocrystalline ribbons was slightly refined with Co substitution.

关键词： nanocrystalline magnets Nd-Fe-B magnets Co substitution magnetic properties thermal stability microstructure

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Salinity fronts shape spatial patterns in zooplankton distribution in Hangzhou Bay

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Acta Oceanologica Sinica 2024年第6期43卷 96-106页

作者： Yepeng Xu Yiqi Wang Lin Zhan Yijun Ou Kangning Jia Ming Mao Xuyu Zhu Zhibing Jiang Yuanli Zhu Wei Huang Ping Du Jiangning zeng Lu shou Feng zhou Key Laboratory of Marine Ecosystem Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Key Laboratory of Nearshore Engineering Environment and Ecological Security of Zhejiang Province Hangzhou 310012China State Key Laboratory of Satellite Ocean Environment Dynamics Ministry of Natural ResourcesHangzhou 310012China Nantong Marine Environmental Monitoring Center Ministry of Natural ResourcesNantong 226002China Key Laboratory of Ocean Space Resource Management Technology Ministry of Natural ResourcesHangzhou 310012China Observation and Research Station of Marine Ecosystem in the Yangtze River Delta Ministry of Natural ResourcesZhoushan 316021China

Ocean fronts play important roles in nutrient transport and in the shaping ecological *** zones in small bays are typically small in scale,have a complex structure,and they are spatially and temporally variable,but there are limited data on how biological communities respond to this *** Bay,a mediumsized estuary in China,is an ideal place in which to study the response of plankton to small-scale ocean fronts,because three water masses(Qiantang River Diluted Water,Changjiang River Diluted Water,and the East China Sea current) converge here and form dynamic salinity fronts throughout the *** investigate zooplankton communities,and temperature,salinity and chlorophyll a(Chl a) in Hangzhou Bay in June(wet perio d) and December(dry period) of 2022 and examine the dominant environmental factors that affect zooplankton community spatial *** then match the spatial distributions of zooplankton communities with those of salinity fronts.S alinity is the most important explanatory variable to affect zooplankton community spatial variability during both wet and dry periods,in that it contributes>60% of the variability in community ***,the spatial distributions of zooplankton match well with salinity *** December,with weaker Qiantang River Diluted Water and a stronger secondary Changjiang River Plume,zooplankton communities occur in moderate salinity(MS,salinity range 15.6±2.2) and high salinity(HS,22.4±1.7) regions,and their ecological boundaries closely match the Qiantang River Diluted Water *** June,different zooplankton communities occur in low salinity(LS,3.9±1.0),MS(11.7±3.6) and HS(21.3±1.9) *** the LS region occurs abnormally in the central bay rather than its apex because of the anomalous influence of rising and falling tides during the sampling perio d,the ecological boundaries still match salinity ***-salinity or brackish-water zooplankter taxa are relatively more abunda

关键词： zooplankton spatial distribution salinity fronts Hangzhou Bay

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Microstructural evolution and mechanical properties of duplex-phase Ti6242 alloy treated by laser shock peening

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Transactions of Nonferrous Metals Society of China 2024年第8期34卷 2521-2532页

作者： Pu-ying SHI Xiang-hong LIU Yong REN zeng TIAN Feng-shou ZHANG Wei-feng HE Institute of Aeronautics Engine School of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710049China Western Superconducting Technologies Co. Ltd.Xi’an 710018China School of Aeronautical Engineering Air Force Engineering UniversityXi’an 710038China

The effects of laser shock peening(LSP)on the microstructural evolution and mechanical properties of the Ti6242 alloy,including the residual stress,surface roughness,Vickers microhardness,tensile mechanical response,and high-cycle fatigue properties,were *** results showed that the LSP induced residual compressive stresses on the surface and near surface of the *** maximum surface residual compressive stress was−661 MPa,and the compressive-stress-affected depth was greater than 1000μ*** roughness and Vickers micro-hardness increased with the number of shocks,and the maximum hardness-affected depth was about 700μm after three LSP *** enhanced the fraction of low-angle grain boundaries,changed the grain preferred orientations,and notably increased the pole density ofαphase on the near surface from 2.41 to *** surface hardness values of the LSP samples increased with the increase of the number of shocks due to work hardening,while the LSP had a limited effect on the tensile *** high-cycle fatigue life of the LSP-treated sample was significantly enhanced by more than 20%compared with that of the untreated sample,which was caused by the suppression of the initiation and propagation of fatigue cracks.

关键词： duplex-phase Ti6242 alloy surface modification laser shock peening gradient microstructure high-cycle fatigue properties

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发酵豆渣的营养特性及其在反刍动物生产中的应用研究

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饲料研究 2024年第3期47卷 170-175页

作者：曾旭周凌博毛寿林吴淑军张玲娄底职业技术学院湖南娄底417000 湖南省绿一佳农业科技发展有限公司湖南娄底417000

豆渣作为营养丰富的农副产品,具有较高的饲用价值。但受保存技术和利用技术限制,豆渣易出现腐败、营养流失和吸收利用率较低等问题。使用发酵技术可以降低豆渣中抗营养因子含量,产生抗氧化和抗菌活性物质,提高豆渣的利用率,延长储存时间... 详细信息

豆渣作为营养丰富的农副产品,具有较高的饲用价值。但受保存技术和利用技术限制,豆渣易出现腐败、营养流失和吸收利用率较低等问题。使用发酵技术可以降低豆渣中抗营养因子含量,产生抗氧化和抗菌活性物质,提高豆渣的利用率,延长储存时间,提高饲用安全性,有助于增强畜禽机体健康。文章通过总结发酵豆渣的营养成分、影响因素及其在反刍动物生产中的应用,为发酵豆渣在反刍动物生产中的推广与利用提供参考。

关键词：发酵豆渣营养成分品质变化反刍动物

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Magnetostriction of the Oriented Crystals in a TbDyFe Alloy

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Chinese Physics Letters 1998年第5期15卷 379-381页

作者： JIANG Cheng-bao zhou shou-zeng WANG Run Department of Materials Science and Engineering Beijing University of Aeronautics and AstronauticsBeijing 100083 State Key Laboratory for Advanced Materials University of Science and Technology BeijingBeijing 100083

The preferred growth directions of Tb0.3Dy0.7Fe1.95 grown by a super-high temperature gradient zone melting directional solidification technique were examined over a large range of the crystal growth velocity(0.5-30 mm/min).The[110]preferred growth direction was found in most case,and the[112]orientation only existed with a certain solidification *** magnetostriction of the[110]oriented samples was poor and had no obvious“stress effect”,which exists in[110]perfect crystals according to *** difference of the magnetostriction between the actual and perfect[110]oriented crystal was discussed in *** poor magnetostriction of the[110]oriented samples was attributed to the special 109.5°angular with two(111)twin growth mechanism,which resulted in the[114]direction along axis in twins,and only the[110]along axis in master.

关键词： solidification perfect Crystal

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不同修剪处理对匍匐翦股颖币斑病的影响

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草原与草坪 2024年第3期44卷 35-42页

作者：范守成曾会明北京林业大学北京100083

【目的】研究不同修剪处理对匍匐翦股颖币斑病发病的影响,为草坪管理提供理论参考。【方法】分别将3种不同修剪频率1天1次(F1)、2天1次(F2)、4天1次(F3)和3种不同修剪高度1.0 cm(H1)、1.5 cm(H2)、2.0 cm(H3)组合作为处理,通过病原菌侵... 详细信息

【目的】研究不同修剪处理对匍匐翦股颖币斑病发病的影响,为草坪管理提供理论参考。【方法】分别将3种不同修剪频率1天1次(F1)、2天1次(F2)、4天1次(F3)和3种不同修剪高度1.0 cm(H1)、1.5 cm(H2)、2.0 cm(H3)组合作为处理,通过病原菌侵染试验测定不同修剪组合下病斑直径大小以及匍匐剪股颖的生理响应。【结果】随着修剪频率和修剪高度的提高,呈现出病斑直径、MDA含量逐渐变小,相关抗氧化酶活性、可溶性蛋白含量逐渐升高的趋势,F1H3组具有最好的病情控制效果(病斑直径为0.43 cm)和最高的抗氧化酶活性,F3H1组病情最重(病斑直径为2.5 cm),相关抗氧化酶活性、可溶性蛋白含量也最低。【结论】草坪在湿度较高的时期适当提高修剪频率和修剪高度可以在一定程度上减轻币斑病的病症。

关键词：修剪匍匐翦股颖币斑病生理响应

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Research progress of m^(6) A methylation in prostate cancer

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Asian Journal of Andrology 2023年第2期25卷 166-170页

作者： shou-Yi Zhang Yu zeng Department of Urology The Cancer Hospital of China Medical UniversityLiaoning Cancer Hospital and InstituteShenyang 110042China

N^(6)-methyladenosine(m^(6)A)is a ubiquitous RNA modification in *** modification is“written”by methyltransferases and then“read”by m^(6)A-binding proteins,followed by a series of regulation,such as alternative splicing,translation,RNA stability,and RNA *** last,the modification is“erased”by demethylases.m^(6)A modification is essential for normal physiological processes in mammals and is also a very important epigenetic modification in the development of *** recent years,cancer-related m^(6)A regulation has been widely studied,and various mechanisms of m^(6)A regulation in cancer have also been *** this review,we summarize the changes of m^(6)A modification in prostate cancer and discuss the effect of m6A regulation on prostate cancer progression,aiming to profile the potential relevance between m^(6)A regulation and prostate cancer *** studies on m^(6)A regulation in prostate cancer may uncover the potential role of m^(6)A methylation in the cancer diagnosis and cancer therapy.

关键词： epigenetic N^(6)-methyladenosine methylation molecular biology prostate cancer

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NUMERICAL SIMULATION OF GAS TURBULENCE ENHANCEMENT BY PARTICLE-WAKE EFFECT

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Journal of Hydrodynamics 2007年第2期19卷 155-159页

作者： zeng Zhuo-zhi zeng Zhuo-xiong NAN Ying HAN shou-lei Aeronautic and Mechanical Engineering college Nanchang University of Aeronautics Nanchang 330063 China

A new turbulence enhancement model was incorporated into the second-order moment two-phase turbulence model and was used to simulate gas-particle flows in swirling chambers and channels with different wall roughness. The results show that compared with the turbulence modification model not accounting for the wake effect, this model, together with the conventional particle source term, gives simulation results in better agreement with the experimental data.

关键词： gas-particle flows turbulencemodification numerical simulation

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Origin of (105) Reflection of X-Ray Diffraction and Quantitative Evaluation of Alignment Degree for Sintered Nd-Fe-B Magnets

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Chinese Physics Letters 2001年第10期18卷 1408-1410页

作者： HE Ye-Qing zhou shou-zeng ZHANG Zhen-rong HAN Bao-shan Beijing Zhong Ke San Huan High-Tech Co. Ltd.?Beijing 100030 State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083 State Key Laboratory ofMagnetism Institute of Physics and Center of Condensed Matter PhysicsChinese Academy of SciencesBeijing 100080

A new method for quantitatively evaluating the alignment degree ofsintered Nd-FeB magnets by x-ray diffraction spectra has been proposed. It has been experimentally revealed that the strong (105) reflection existing in almost all x-ray diffraction spectra of sintered Nd-FeB magnets stems from the misalignment grains whose easy axes are at an angle of 15.5° with respect to the orientated direction of the magnet.

关键词： magnets Origin alignment

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基于IMM框架的多模型选择算法在多级运载火箭跟踪中的应用

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雷达与对抗 2024年第2期44卷 11-15,46页

作者：曾怡靳俊峰寿博中国电子科技集团公司第三十八研究所合肥230088 孔径阵列与空间探测安徽省重点实验室合肥230088

通过研究多级运载火箭飞行全过程,搭建包括多级运载火箭仿真数据产生器、数字回波产生器、模拟目标跟踪系统、精度评估系统在内的半实物仿真平台,采用基于IMM框架的多模型选择算法进行模拟跟踪实验,得到一组匹配参数,将实测数据作为半... 详细信息

通过研究多级运载火箭飞行全过程,搭建包括多级运载火箭仿真数据产生器、数字回波产生器、模拟目标跟踪系统、精度评估系统在内的半实物仿真平台,采用基于IMM框架的多模型选择算法进行模拟跟踪实验,得到一组匹配参数,将实测数据作为半实物仿真平台数据输入,进行算法验证。仿真结果表明,基于IMM框架的多模型选择算法具有鲁棒性高、跟踪无滞后的特征,适于工程实际应用。

关键词：多级运载火箭半实物仿真平台多模型选择算法

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